Related topics: mating , females
Male
hideMale (♂) refers to the sex of an organism, or part of an organism, which produces small mobile gametes, called spermatozoa. Each spermatozoon can fuse with a larger female gamete or ovum, in the process of fertilization. A male cannot reproduce sexually without access to at least one ovum from a female, but some organisms can reproduce both sexually and asexually.
Not all species share a common sex-determination system. In humans and most animals, sex is determined genetically but in other species it can be determined due to social, environmental, or other factors. The existence of two sexes seems to have been selected independently across different evolutionary lineages (see Convergent Evolution). Accordingly, sex is defined operationally across species by the type of gametes produced (ie: spermatozoa vs. ova) and differences between males and females in one lineage are not always predictive of differences in another.
Male/Female dimorphism between organisms or reproductive organs of different sexes is not limited to animals; male gametes are produced by chytrids, diatoms and land plants, among others. In land plants, female and male designate not only the female and male gamete-producing organisms and structures but also the structures of the sporophytes that give rise to male and female plants.
For more information about Male, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with males
Biologist Shows Female Birds of a Feather Compete Together
Dec 15, 2009 |
5 / 5 (2) |
0
(PhysOrg.com) -- With its flamboyantly decorated plumage, the peacock is a classic example of how males among many bird species are more visually eye-catching than their female partners. But new research, ...
Search results for males
Hollywood adds money, talent to made-for-Web shows
11 hours ago |
2 / 5 (1) |
0
(AP) -- Web sites that buy original video clips often pay so little that "The Bannen Way," a flashy crime thriller debuting online, looked destined to be made poorly if it could be made at all.
Rate of autism disorders climbs to 1 percent among 8-year-olds
Dec 18, 2009 |
not rated yet |
11
Autism and related development disorders are becoming more common, with a prevalence rate approaching 1 percent among American 8-year-olds, according to new data from researchers at the University of Alabama at Birmingham ...
New research explains orchids' sexual trickery
Dec 17, 2009 |
4.8 / 5 (4) |
0
A new study reveals the reason why orchids use sexual trickery to lure insect pollinators. The study, published in the January issue of The American Naturalist, finds that sexual deception in orchids leads to a more effici ...
Wild chimps have near human understanding of fire, study says
Dec 17, 2009 |
4.5 / 5 (8) |
0
(PhysOrg.com) -- The use and control of fire are behavioral characteristics that distinguish humans from other animals. Now, a new study by Iowa State University anthropologist Jill Pruetz reports that savanna ...
Gene linked to a rare form of progressive hearing loss in males is identified
Dec 17, 2009 |
not rated yet |
0
A gene associated with a rare form of progressive deafness in males has been identified by an international team of researchers funded by the National Institute on Deafness and Other Communication Disorders. The gene, PRPS1, ...
Shift working aggravates metabolic syndrome development among middle-aged males
Dec 17, 2009 |
4 / 5 (1) |
0
Shift work exposures can accelerate metabolic syndrome (MetS) development among the large population of middle-aged males with elevated alanine aminotransferase (ALT). Elevated serum alanine aminotransferase (e-ALT) is a ...
Small Fingers More Touch Sensitive
Medicine & Health / Neuroscience
Dec 16, 2009 |
4.7 / 5 (3) |
0
When it comes to finger sensitivity, bigger isn't always better.
Gene identified as cause of some forms of intellectual disability
Dec 15, 2009 |
not rated yet |
0
A gene involved in some forms of intellectual disability has been identified by scientists at the Centre for Addiction and Mental Health (CAMH), as published this month in The American Journal of Human Genetics. The gene i ...
Researchers ID traits of people with rare accelerated aging syndrome
Dec 15, 2009 |
not rated yet |
0
UT Southwestern Medical Center researchers have provided the most extensive account to date of the unique observable characteristics seen in patients with an extremely rare premature aging syndrome.
Researchers find reproductive germ cells survive and thrive in transplants, even among species
Dec 15, 2009 |
5 / 5 (2) |
1
Reproductive researchers from the University of Pennsylvania and The Children's Hospital of Philadelphia have succeeded in isolating and transplanting pure populations of the immature cells that enable male ...
List of search results for males
